OT: Grey-listing?

[James Gray]

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On Mon, 23 May 2005 11:51 am, James Gray wrote:
> I've started down the road of grey-listing and have configured but not
> "activated" the sendmail greylist-milter.  My questions to the group are
> both technical and political:
>
> 1. those who have used this milter; how effective is it in stemming the
> tide of spam compared to "just" sendmail + mailscanner + SA +
> RBL(OutBlaze, Razor etc)??

For those who are interested, in the first 24 hours of operation our spam is 
down by almost 40% and server load down by about the same. Â Those numbers 
are 
%-age of what was happening prior to implementing milter-greylist.

Pre-greylist:
Average spam: 55% of our total mail volume

Post-greylist
Spam: 32% of our total mail volume.

100 - (32/52)*100 = 39% reduction in spam :):) Or about 20% reduction in 
total 
mail flow. Â Very nice on a machine that handles around 50,000 messages a 
day.

We're very happy and the users, both internal and external, are none the 
wiser. Â All is well with the world and we are slowly making ground on the 
spammers (until they build smarter spambots then we're back to square 1).

Cheers,

James
-- 
Bower's Law:
 Talent goes where the action is.

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